swing怎么画三角形
已知一个三角形的底和高，也就是知道了面积，不管画在window的什么位置，怎么画出来？

public abstract void fillPolygon(int[] xPoints,
int[] yPoints,
int nPoints)
这个方法么？ 有谁能给写个小例子么？谢谢了。
[最优解释]
方法一：
package test1;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestA {

public static void main(String[] args) {
JFrame jf = new JFrame();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setContentPane(new MyPanelA());
jf.setSize(new Dimension(300,300));
jf.setVisible(true);
}
}
class MyPanelA extends JPanel{
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;

int[] yPoints = {10,30,20};
int[] xPoints = {10,10,30};
int nPoints = 3;
g2.drawPolygon(xPoints, yPoints, nPoints);
}
}

方法二：
package test1;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestB {

public static void main(String[] args) {
JFrame jf = new JFrame();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setContentPane(new MyPanelB());
jf.setSize(new Dimension(300,300));
jf.setVisible(true);
}
}
class MyPanelB extends JPanel{
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;

g2.drawLine(10, 10, 10, 30);
g2.drawLine(10, 30, 30, 20);
g2.drawLine(30, 20, 10, 10);

}
}

[其他解释]
至少有两种方法，一直画直线的

Point p1;  
Point p2;  
Point p3;  
   
g.drawLine(p1.x, p1.y, p2.x, p2.y);  
g.drawLine(p2.x, p2.y, p3.x, p3.y);  
g.drawLine(p3.x, p3.y, p1.x, p1.y);  

另外一种利用Swing 2D多边形API

int[] xPoints = {100, 100, 200};
    int[] yPoints = {100, 200, 200};
    g.drawPolygon(xPoints, yPoints, 3);

[其他解释]
知道三角形的底和高，这样的三角形有无数多个
[其他解释]
学习了楼主
[其他解释]
public abstract void fillPolygon(int[] xPoints, int[] yPoints, int nPoints)
主要是三个参数弄懂了就会用了，xPoints和yPoints的值是一一对应的，代表x、y坐标的集合，

例如：
int xPoint[] = {100,200,300};
int yPoint[] = {500,600,700};
代表了三个点(100,500),(200,600),(300,700)
nPoints代表多边形有几条边
[其他解释]
已知底和高的确确定不了一个三角形吧